An Irish technology company has landed a €30m funding round from investors that include Mark Zuckerberg, Sheryl Sandberg and Twitter boss Jack Dorsey.

Intercom, which makes online customer communication tools, is to use the money to double its workforce in Dublin from 70 to 140 over the next year. The company says that most of these will be engineering jobs.

Intercom’s total funding now amounts to $66m (€58m), following a €17m funding round last year.

The company is one of a number of breakout tech firms to emerge from Dublin's technology ecosystem in recent years.

The company had previously raised over €5m in initial funding from investors which included ex-Twitter founder Biz Stone.

Company co-founder and chief executive Eoghan McCabe has said that the company wants to seek a public flotation and reach a valuation of €1bn.Intercom is regularly cited as a breakthrough customer service product by senior company executives in Silicon Valley. It currently has 7,000 paying customers in 85 countries, many of which are tech companies such as Ancestry.com, New Relic and Shopify. Intercom is on course to grow its revenue one hundred fold since its first funding round in June 2013, according to a company spokesman.

The company’s customers communicate 3m times per day with over 250m people using the platform, said the spokesman.

Other investors in the company’s latest funding round include The Social + Capital Partnership and Bessemer Venture Partners.

Intercom is divided between San Francisco and Dublin, with the company's design and engineering hubs based in Dublin and its business development based in the US.

“We’re a product-first company, with 50pc of our employees working in research and development,” said Intercom co-founder Eoghan McCabe. “We nearly tripled headcount in 2014, and already in 2015 have nearly doubled to over 140 employees. We’ll double globally again over the next 12 months and build out our platform so every single team in a business can use Intercom for all customer communication.”

Mr McCabe is based in San Francisco while the company’s other three co-founders, Des Traynor, David Barrett and Ciaran Lee, are based in Dublin.